Granted Patent
Utility
US 4,251,896 · App. 06/049,876
Floor machine with gimballed brush drive
Inventor:
Thomas S. Block
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Jun 19, 1979
Inventor
Thomas S. Block
Assignee (at issue)
Clarke-Gravely Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.